Coupling device for screw-drills.



No. 745,039. PATENTED NOV. 24,1903" 0. OHRISTIANSEN. COUPLING DEVICE FOR SCREW DRILLS.

APPLICATION FILED JUNE 2, 1903.

H0 MODEL.

Jays

iPatented November 24, 1903.

Fa'rnrrr Utmost.

CHARLES OI'IRISTIANSEN, OF GELSENKIRCHEN, GERWANY.

COUPLING DEVlCE FOR SCREVV-DRILLS.

SPECIFICATION forming part of Letters Patent No. 745,039, dated November 24, 1903.

Application filed June 2,1903. Serial No. 159,828. (No model.)

To all whom it may concern:

Be it known that LCHARLES CHRISTIANSEN, engineer, a subject of the King of Prussia, residing at Gelsenkirchen, Province of Westphalia, Prussia, Germany, have invented a certain new and useful Coupling Device for Screw-Drills, of which the following is a specification.

Screw or serpentine drills as heretofore constructed for minework present the inconvenience that it is necessary to use screw or serpentine drills of different lengths for boring holes of different depth. Thus for boring a drill-hole of, say, twenty inches in depth a borer of a certain length is required; but if, on the other hand, a drill-holeof fiftynine inches is to be bored the screw-borer must be considerably longer. If a drill-hole is to be bored in a narrow shaft the width of which is smaller than the depth of the drillhole, it is not possible to accomplish this object in case the drill-hole is to be arranged at substantially a right angle to the longitudinal axis of the shaft, since the shaft is too narrow for fixing the drill borer in place. In the case of the now generally employed drillborers with stationary bits when it is desired to sharpen the bit the entire borer has to be carried from the mine to the shop, which is a greatinconvenience in the case of long borers.

The object of the present invention refers to a coupling device for screw or serpentine drill borers by means of which screwborers of any desired length may be composed of shorter sections. Borers constructed in this manner allow of drill-holes to be bored of any desired depth in a narrow shaft and transversely to the longitudinal axis of the said shaft. If a borer of a certain length has been driven in up to its rear end up to the mouth of the drill-hole, an extension-piece, and so on, is attached to it by means of myimproved coupling device. On the otherhand, when it is desired to sharpen the bit of the borer it is only necessary to carry the lower part of the screw or serpentine borer which is provided with the bit to the shop.

My improved coupling device is shown by way of example in the accompanying drawings.

In the drawings, Figure 1 is an illustration of two sections of a screw or serpentine borer coupled together. Fig. 2 is substantially a similar view showing the bit-bearing partcoupled with a subsequent section. Figs. 3 and at are illustratiousot' two adjoining pieces of the parts of the screw-borer. Figs. 5, 6, and 7 show the coupling-sleeve. Figs. 8 and 9 are respectively sections on the lines A B and O D of Figs. 3 and 4.

The two sections a and b of the screw-drill borer which are to be united together are provided, as shown in Figs. 3 and 4t,with projecting pieces 0 and (Z, the projection 61 being provided with a groove 6, Fig. 9, capable of engagement with the correspondingly-shaped edge e of the projection 0. (Shown in Fig. 8 of the drawings.) The union joint thus formed between the two parts a. and Z) is not running in the direction of the longitudinal axis of the parts to be united, but is arranged angularly with relation thereto, so that the two projections c and d are tapered off at the sides facing each other. The union of the thus assembled parts is effected by a sleeve f, fitting'over the parts CL and b and shown in Figs. 5, 6, and 7 of the drawings. The cavity of the sleeve corresponds to the'sectional area of the assembled projections c and d. In order to effect the coupling, the sleeve is first placed on the projection 61 so that the bottom edge of the sleeve projects only for the distance of afraction of an inch beyond the front edge of the projection d. Then the part a, with the projection c, is introduced into the cavity of the sleeve, the inclined position of the joint at the union of the pieces 0 and cl causing the lug g on the projecting piece 0 to engage with the groove 72. Therenpon the two parts a and Z) are forced together, which results in the coupling-sleeve assuming the position shown in Fig. 1 of the drawings, the two parts a and I) being thereby secured against independent movement both during the right-hand and left-hand rotation of the borer. The coupling-sleeve may preferably be connected with one of the two screw or serpentine drill borer sections-with the part b, for instance-which is effected by arranging a groove 2' in the projecting piece (1, the sides of said groove t engaging with the end of a screw 7t, arranged in the sleeve. By means of the said groove 2' the sleeve may be displaced upand down along the projecting piece d without the sleeve being pulled off entirely from the projecting piece d, and thereby preventing its being lost. When the parts are coupled together, the screw 7r after being tightened may also serve as a means to prevent the loosening of the coupling-sleeve, and in particular when the drill-borer is withdrawn from the drill-hole. The broader outer faces of the coupling-sleeve may be also provided with projecting inclined ribs m, which replace the ribs of the screw or serpentine borer,which ribs are interrupted at the coupling-joint, thus allowing the bore-dust to be moved toward the mouth of the drill-hole at the coupling-joint also. However, these ribs m are not absolutely necessary, and they do not enter into the subject-matter of the present invention.

What I claim, and desire to securebyLetters Patent of the United States, is

1. Coupling means for screw or serpentine drill borers in which the two parts a and b which are to be coupled together, are provided with projecting pieces 0 and (1 respectively which unite in a joint arranged angularly with relation to the longitudinal axis of the borer and which are assembled together by a coupling-sleeve f surrounding the said projecting pieces, of which the projecting piece 0 engages by means of a lug g with a groove h of the coupling-sleeve fwhile the other projecting piece dis provided with a longitudinal groove which is entered by a screw 71 inserted in the coupling-sleeve, in order to prevent loosening of the coupling on the withdrawal of the drill-borer and also. to prevent the dropping 0d of the sleeve from the borer part b in the uncoupled position of the parts.

2. In a coupling device for drills or the like, the combination of two drill-sections formed at the connecting ends thereof with projections, one of the projections being provided with a longitudinal groove in one edge and the other with a correspondingly-shaped edge, and a fastening-sleeve inclosiug the said projections and having an interlocking engagement with one of the projections.

3. In a coupling device for drills or the like, the combination of two drill-sections, formed at the connecting ends thereof with longitudinal projections, each adapted to fit the other at one side thereof, and the two being united by an angular joint, one of said projections being provided with a lug and the other with a groove, and a fastening-sleeve having a groove receiving said lug and provided with ascrew entering the said first-named groove.

4. In a cou pling device for drills or the like, the combination of two drillsections formed at the connecting ends thereof with projections, one of the projections having a longitudinal groove in one edge, and the other a correspondingly-shaped edge and a lug at its lower end, and a fastening-sleeve inclosiug the said projections and provided with a groove to receive the said lug.

In witness whereof I have signed my name in the presence of two subscribing witnesses.

' Witnesses:

WOLDEMAR I-IAUPT, HENRY HASPER. 

